When braking gently at very low speed forward and reverse a scraping noise appears

SOURCE: Scraping noise in rear of 2000 Toyota Rav4 AWD

just wanted to stop to offer some tips. I just put in new brakes on last night. I too had the same problem. The brakes were fine, but I replaced them anyway. The drum seem fine, and my emergency cable was a bit loose too. What you can try is hiting the ebrake while going in reverse or in drive. It may help. If not, adjust the ebrake cable will be needed, it not too hard to do. It should be by the rear tires towards the center.

SOURCE: while driving truck makes a humming sound in drive now no reverse

If you have no reverse then yes it needs to be rebuilt. as far as the whining it could be in one of the differentials. or in trans? just depends on where you hear it

SOURCE: breaking at slow speed there is a bad bearing o scrunching noise.

Yeah , You are correct. The wheel bearing is very common problem at low speed , like in a parking lot trying to park, I would take to local mechanic to have the vehcile checked out.
The repair is not very hard and no to labor intensive a few hours at most.

SOURCE: 2005 Toyota Camry Sportivo brakes making scraping sound.

Hi there,
when the noise is heard, try putting very slight pressure on the brake pedal and see if the noise goes away. If this is the case then definitely the brakes have to be removed and checked again. But if the noise is still present then it's something else doing that noise ans further investigations needs to be carried oput.
Cheers

SOURCE: Weird noises in drive and reverse

The high pitched whine in reverse sounds normal for a honda. Ever honda I have had makes a similar noise while in reverse. The spinning, scraping noise in drive is not normal. You might want to see a mechanic about that.